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Finding the Fourth Proportional to 86,656.80, 129,985.20 and 76,807.20

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Solution

The fourth proportional to 86,656.80, 129,985.20 and 76,807.20 is: 115,210.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,656.80 : 129,985.20 = 76,807.20 : x
  2. Step 2: Convert to fraction form
    86,656.80/129,985.20 = 76,807.20/x
  3. Step 3: Cross multiply
    86,656.80x = 129,985.20 × 76,807.20
  4. Step 4: Simplify right side
    86,656.80x = 9,983,799,253.44
  5. Step 5: Solve for x
    x = 9,983,799,253.44/86,656.80
  6. Step 6: Final answer
    x = 115,210.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.